PHOTOCONVERSION OF SUBSTITUTED OXAZOLES BY EXCITATION WITH A XECL EXCIPLEX LASER

Photoconversion of 2,5-diphenyloxazole (PPO) and 2-(4-pyridyl)-5-pheny loxazole (4PyPO) was investigated under the conditions of laser genera tion by excitation with a XeCl laser. Absolute quantum yields of the P PO and 4PyPO photoconversion in different solvents and relative quantu m yields of final photoproducts were determined. The results of quantu m-chemical investigations of the oxazole ring opening photoreaction an d the experimental data made it possible to confirm the mechanism of P PO photodissociation and to suggest the mechanism of the 4PyPO photoco nversion.